XPress XPress bridges XenForo and WordPress together for a smooth integration making managing your software systems easier and creating a fluid user experience. Many platform directors struggle to keep two distributed software systems...
There may be others but this was what I found when I was looking for something a while back (did not end up doing anything with WordPress).
Thank you for the insights, I have a WordPress plugin going into beta soon that will accommodate some of what you've mentioned (proving the concept in my own business first). I will post more about it here when the time is right.